Pulp-strainer.



T. QVILLER & H. STUB. PULP STRAINER.

APPLICATION FILED APB.26, 1912.

1,092,389; Patehted Apr. 7, 19m

UNITED @TATE% PATENT OFFICE.

rrinonoa QVILLER, or LILLns'raoMMEn, Ann HANS s'run, or CHRISTIANIA, NORWAY.

PULP-STRAINER.

noaasso.

Specification of Letters Patent.

Patented Apr. 7, 1914..

To all whom it may concern Be it known that we, THEODOR QvILLnR and Hans STUB, subjects of the King of Norway, residing at Lillestrommen and Christiania, Norway, respectively, have invented certain new and useful Improvements in Pulp-Strainers; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Our invention relates to pulp strainers of the horizontal shaft type having a cylindrical or nearly cylindrical straining body and a centrifugal drum rotating inside the straining cylinder.

Our invention consists in improved means for distributing the pulp to the blades of the centrifugal drum from a central tube.

In pulp strainers used for straining cellulose it is important that the pulp be not beaten by the blades of the centrifugal fan, because knots and pieces of wood which are only partly digested should not be disintegrated. In pulp strainers hitherto known of the type referred to knots that are only partly digested are disintegrated by the beating.

In the accompanying drawing we have shown a pulp strainer embodying our inven tion.

Figure 1 is a vertical axial section through a strainer. Fig. 2 is a development of a portion of the inlet side of the fanbody showing the manner in which the distributing channels are arranged.

The general arrangement and constructional features of a strainer of this kind being so well known it is sufiicient for explaining the drawing to state that the shaft A carries a fan having blades B which may be radially or nearly radially disposed or they may have a somewhat curved shape, C designates the hub of the fan and D a rim between which and the hub there is a curved body E. This curved body is preferably of a conical shape nearest the hub and this cone enters a pulp feeding tube M there being mounted in this tube an axially adjustable ring N, serving as a valve to regulate the flow of pulp into the strainer from the tube. The curved body E is provided with obliquely disposed ribs F, forming between them channels which lead the pulp from the cone to the blades, in such manner, that the pulp is evenly dispersed to the blades. As the pulp is in this manner successively imparted the rotary motion and there is no sudden change in the direction of its flow there will be no beating action on the pulp but the fan will smoothly take it up and press it outwardly on to the straining surface in a nearly tangential direction. The adjustment of the ringvalve N may be effected by a lever 0, connected with the valve by means of rods P and held in any desired position by means of the screw wheels R on the rod S.

Claims.

1. In a pulp strainer, a rotary shaft, a hub thereon having a conical end, radial fan blades on the hub, a distributing body inside the blades forming a continuation of said end and adapted to distribute pulp onto the blade at different distances from said end, and a centrally disposed tube arranged to feed pulp onto the conical end of the hub.

2. In a pulp strainer, a horizontal shaft, radial fan blades carried by the shaft, a pulp distributing body on the inside of the blades having a conical portion forming a hub of said distributing body, a centrally disposed feeding tube, and a ring valve adjustably mounted in said tube and surrounding the conical hub.

8. In a pulp strainer, a horizontal shaft, radial fan blades carried by the shaft, a curved pulp-distributing body on the inside of the blades provided with obliquely disposed ribs forming groups of channels opening on each blade at different distances from the pulp inlet.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

THEODOR QVILLER. HANS STUB. lVitnesses:

M. E. GUL'roRNnsnN, N. SCHIANDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

